From f257d6dcda0187693407e0c2e5dab69bdab3223f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 19 Apr 2019 22:18:17 -0700 Subject: KVM: Directly return result from kvm_arch_check_processor_compat() Add a wrapper to invoke kvm_arch_check_processor_compat() so that the boilerplate ugliness of checking virtualization support on all CPUs is hidden from the arch specific code. x86's implementation in particular is quite heinous, as it unnecessarily propagates the out-param pattern into kvm_x86_ops. While the x86 specific issue could be resolved solely by changing kvm_x86_ops, make the change for all architectures as returning a value directly is prettier and technically more robust, e.g. s390 doesn't set the out param, which could lead to subtle breakage in the (highly unlikely) scenario where the out-param was not pre-initialized by the caller. Opportunistically annotate svm_check_processor_compat() with __init. Signed-off-by: Sean Christopherson Reviewed-by: Cornelia Huck Signed-off-by: Paolo Bonzini --- virt/kvm/arm/arm.c | 4 ++-- virt/kvm/kvm_main.c | 9 ++++++--- 2 files changed, 8 insertions(+), 5 deletions(-) (limited to 'virt') diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 7eeebe5e9da2..d2389033e9d6 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -105,9 +105,9 @@ int kvm_arch_hardware_setup(void) return 0; } -void kvm_arch_check_processor_compat(void *rtn) +int kvm_arch_check_processor_compat(void) { - *(int *)rtn = 0; + return 0; } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ca54b09adf5b..b2579841263f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4224,6 +4224,11 @@ static void kvm_sched_out(struct preempt_notifier *pn, kvm_arch_vcpu_put(vcpu); } +static void check_processor_compat(void *rtn) +{ + *(int *)rtn = kvm_arch_check_processor_compat(); +} + int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, struct module *module) { @@ -4255,9 +4260,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, goto out_free_0a; for_each_online_cpu(cpu) { - smp_call_function_single(cpu, - kvm_arch_check_processor_compat, - &r, 1); + smp_call_function_single(cpu, check_processor_compat, &r, 1); if (r < 0) goto out_free_1; } -- cgit v1.2.3-59-g8ed1b